Investigate motion during a collision

Make a prediction and investigate

Observe a collision at the initial settings. Change one control, repeat, and compare the motion before and after contact.

Controls in the actual lab

• Incoming mass: starts at 1 kg; available range 0.5–4 kg.
• Target mass: starts at 1 kg; available range 0.5–4 kg.
• Incoming speed: starts at 4 m/s; available range 2–8 m/s.

Momentum is mass times speed. In a fair crash it is kept. Equal masses swap. A heavier incoming mass keeps going.

Discuss the evidence

Track both objects, not just the one you changed. Describe what each did before and after the collision.

Try it beyond the activity

Explain why looking at only one object could give an incomplete account of a collision.

Record your thinking

Sources and limits

This companion uses the published Momentum activity and its learning guidance. Review any original sources linked there. It is a discussion plan by Lesson Worlds, not a scored assessment, a standards certification, or evidence of learning gains.

Use this activity with a learner

Families and educators · choose by prior knowledge

Learning goal: Momentum is mass times speed. In a fair crash it is kept. Equal masses swap. A heavier incoming mass keeps going.

Before you begin: Read the controls for Incoming mass, Target mass, Incoming speed. Make one prediction before changing a setting.

Check understanding: Ask for one observation, the evidence that supports it, and a question to investigate next.

A simulation simplifies the real world. Explain which conditions stayed fixed; a successful run alone does not demonstrate mastery.

Activity and guide by Lesson Worlds. About the platform.